AI writing tutor

Feedback on your texts — in seconds.

RedPen reads your text, checks it against your teacher's criteria and instantly gives you fair, concrete feedback — strengths, improvements and one clear next step.

Start for free How it works

Completely free  ·  No installation  ·  With your TheRedStonee account

01 — How it works

Three steps to better writing.

Whether essay, discussion, application or homework — RedPen guides you through revising.

1

Join a class

Your teacher gives you a join code. Enter it — and you see every assignment.

2

Submit your text

Write or paste your text. RedPen knows the assignment and the criteria.

3

Get feedback

Seconds later: strengths, concrete improvements and a clear next step — then revise.

02 — Features

Feedback that actually helps.

RedPen never writes for you — it shows you how to get better yourself.

Based on your criteria
The teacher sets the criteria — RedPen evaluates exactly against them.
Strengths first
Every feedback names what is already good first — then the improvements.
Revise as often as you like
Adjust your text, resubmit, get fresh feedback — until you are happy.
Any language
Texts and feedback in German, English and many more languages.
Teachers stay in control
Teachers see all submissions, the AI feedback and can add their own comments.
Learning, not cheating
RedPen never delivers a ready-made solution — only hints, examples and guiding questions.
03 — Who it is for

For teachers and learners.

For teachers

  • Create classes and share them via code
  • Set assignments with your own criteria
  • All submissions and AI feedback at a glance
  • Add your own comment to any submission

For students

  • Join in seconds with a code
  • Instant feedback — no waiting for corrections
  • Concrete tips instead of just a grade
  • Revise as often as you want

Ready for better feedback?

Sign in with your TheRedStonee account and get started right away — as a teacher or a learner.

Start for free